<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .wrapper {}

        .box {
            float: left;
            width: 200px;
            background-color: red;
        }
    </style>
</head>

<body>
    <div class="wrapper">
        <div class="box">占位文字</div>
    </div>
</body>

</html>